Centrifugal turbine for breathing-aid devices

Abstract

The invention concerns an electric turbin ( 1 ) comprising a turbine rotor ( 4, 7 ), a turbine stator ( 2, 3 ), an electric motor member ( 5, 6 ) for driving the rotor ( 4, 7 ) in rotation relative to the stator ( 2, 3 ), and having the following features: the turbine stator ( 2, 3 ) comprises a stator body defining a compression chamber ( 12 ); the turbine rotor ( 4, 7 ) includes a plurality of blades ( 26, 27 ) integral with a shaft ( 4 ) mounted coaxially rotating in the body ( 2, 3 ) of the turbine stator; the electric motor member ( 5, 6 ) comprises a toroidal motor stator ( 6 ) housed in a motor housing ( 16, 23 ) of the turbine stator ( 2, 3 ), at the center of the toroidal compression chamber ( 12 ) and a motor rotor ( 5 ) mounted on the shaft ( 4 ) of the turbine rotor, axially opposite the motor stator ( 6 ).

1. An electric turbine ( 1 ) comprising a turbine rotor ( 4 ,  7 ), a turbine stator ( 2 ,  3 ), and electric motor member ( 5 ,  6 ) intended to drive the rotor ( 4 ,  7 ) rotationally with respect to the stator ( 2 ,  3 ), wherein
 the turbine stator ( 2 ,  3 ) comprises a stator body defining a generally toric compression chamber ( 12 ) provided with an annular opening;  
 the turbine rotor ( 4 ,  7 ) comprises a set of blades ( 26 ,  27 ) extending generally radially from a central air inlet formed by an annular intake duct ( 11 ) to the annular opening of the compression chamber ( 12 ) of the turbine stator ( 2 ,  3 ), this set of blades ( 26 ,  27 ) being fixed to a shaft ( 4 ) mounted coaxially able to rotate in the turbine stator body;  
 the electric motor member ( 5 ,  6 ) comprises a toric motor stator ( 6 ) housed and fixed in a motor housing ( 16 ,  23 ) of the turbine stator ( 2 ,  3 ), at the centre of the toric compression chamber ( 12 ), and a motor rotor ( 5 ) mounted and fixed on the turbine rotor shaft ( 4 ), axially opposite the motor stator ( 6 ).  
 
     
     
       2. A turbine according to  claim 1 , characterised in that one out of the motor stator ( 6 ) or rotor ( 5 ) is a permanent magnet. 
     
     
       3. A turbine according to  claim 1 , characterised in that at least one out of the motor stator ( 6 ) or rotor ( 5 ) is or are a toric winding. 
     
     
       4. A turbine according to  claim 1 , characterised in that the turbine rotor shaft ( 4 ) is mounted on at least one bearing ( 13 ,  20 ) coaxial with the annular intake duct ( 11 ). 
     
     
       5. A turbine according to  claim 1 , characterised in that the turbine rotor shaft ( 4 ) is mounted on at least one bearing ( 14 ) situated in the motor housing. 
     
     
       6. A turbine according to  claim 1 , characterised in that the stator body ( 2 ,  3 ) comprises two parts cooperating with one another and delimiting the toric compression chamber ( 12 ). 
     
     
       7. A turbine according to  claim 1 , characterised in that the blades ( 26 ,  27 ) are carried by an overmoulded wheel ( 7 ) forming a sleeve on the turbine rotor shaft ( 4 ). 
     
     
       8. A turbine according to  claim 7 , characterised in that said sleeve comprises a shoulder intended for the axial support of the motor rotor ( 5 ). 
     
     
       9. A turbine according to  claim 1 , characterised in that the blades ( 26 ,  27 ) are carried by a truncated cone-shaped wheel ( 7 ). 
     
     
       10. A turbine according to  claim 9 , characterised in that the blades ( 26 ,  27 ) are formed from a flat wall fixed perpendicular to the surface of the wheel ( 7 ), this wall having a generally trapezoidal shape and having a greater height in the central part of the wheel ( 7 ) than in its peripheral part. 
     
     
       11. A turbine according to  claim 10 , characterised in that at least certain ( 27 ) of said blades ( 26 ,  27 ) comprise, in their part disposed in the central part of the wheel, a protruding tip intended to follow the shape of the annular intake duct ( 11 ). 
     
     
       12. A turbine according to  claim 11 , characterised in that one blade out of two comprise, in their part disposed in the central part of the wheel ( 7 ), a protruding tip intended to follow the shape of the annular intake duct ( 11 ). 
     
     
       13. A turbine according to  claim 9 , characterised in that certain of said blades ( 26 ,  27 ) form an angle of 5 to 60 degrees with the radius of the wheel ( 7 ) passing through the end of the blade, at the periphery of the wheel ( 7 ).